Unable to Access My 5-Year-Old Garena Free Fire Account on iPhone

Hello,

My Free Fire account is 5 years old. When I try to log in from my iOS (iPhone) device via Facebook, it connects to a different new account. Despite logging out, Free Fire saves the information and directly switches to this new account when I log in again. I've tried changing Facebook settings, deleting, and reinstalling the game, among other solutions, but nothing works to delete the saved information.

The account information I want to access:
ID: 286329889
Diamonds: 5
Level: 64

The account information I want to log out of (permanently delete):
ID: 963033676
Diamonds: 0
Level: 1